About the author: Hiroshi Horikoshi, Imperial Japanese Army interpreter; a civilian employee with a rank equivalent to first lieutenant, attached to the 65 Bde HQ at Baguio, and on detached service as interpreter in Northern Luzon. The Allied Translator and Interpreter Section, South West Pacific Area document states that,
He was appointed Army interpreter 15 April 42 and sailed to Manila. In the Philippines he interrogated American and Filipino POW’s, translated documents, accompanied punitive expeditions in Northern Luzon and was very active in the Japanese propganda and pacification program. On  July 43 Horikoshi left Manila for Rabaul. … Captured 15 Mar 44 [Grove Island]
About the diary:
Diary covering period May 1942 to July 1943, included in Doc. 11779 prepared by Allied Translator and Interpreter Section, South West Pacific Area. The Philippine Diary Project contains the entries from May 8, 1942 to July 28, 1943 (departure from Manila). The capitalization used in the document has been retained.